Audio switch circuit with slow turn-on

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United States of America Patent

PATENT NO 9877104
SERIAL NO

14748066

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Abstract

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An audio switch circuit includes negative feedback paths and a transistor that serves as a switching component. The negative feedback paths are turned ON to couple a source voltage and a drain voltage of the transistor to the gate of the transistor when the audio switch circuit is turned ON. The negative feedback paths reduce the slew rate of the gate-to-source voltage of the transistor, thereby slowing the turn-ON of the audio switch circuit to prevent or minimize unwanted audible noise. The negative feedback paths can be turned OFF after a period of time after the audio switch circuit is turned ON for improved total harmonic distortion.

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Patent Owner(s)

Patent OwnerAddress
FAIRCHILD SEMICONDUCTOR CORPORATION5005 E MCDOWELL ROAD MAILDROP A700 PHOENIX AS 85008

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Huang, Lei Beijing, CN 286 2136
Li, Eric Beijing, CN 99 1330
Stulz, Julie Scarborough, US 1 0

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